(1. 長(zhǎng)沙理工大學(xué) 化學(xué)與生物工程學(xué)院，長(zhǎng)沙 410114；
2. 中南大學(xué) 化學(xué)化工學(xué)院，長(zhǎng)沙 410083)
摘 要: 以鈦酸丁酯為原料，用低溫超聲水解方法合成不同摻雜W濃度的金紅石型TiO2光催化劑，采用XRD、PL、DRS和BET等技術(shù)進(jìn)行催化劑性能的表征。在光源為高壓汞燈和氙燈、Fe3+為電子受體、懸浮液pH值為2.0的條件下，考察W摻雜對(duì)金紅石型TiO2的光催化分解水析氧活性的影響。結(jié)果表明：當(dāng)W摻雜量為1.0%~4.0%(摩爾分?jǐn)?shù))時(shí)，W摻雜沒有引起金紅石型TiO2晶型的改變，表面形成氧空位，在導(dǎo)帶底附近形成施主能級(jí)，有利于光生電子和空穴的分離，摻雜催化劑光致發(fā)光強(qiáng)度與其光催化析氧活性的變化趨勢(shì)一致；當(dāng)W摻雜量為2.0%時(shí)，摻雜催化劑的光催化分解水析氧活性最高，在紫外光和可見光下光催化分解水的析氧速率分別為148.8 μmol/(L∙h)和102.9 μmol/(L∙h)，分別比金紅石型TiO2摻雜改性前的析氧速率提高了30.6%和65.7%.
關(guān)鍵字: 金紅石型TiO2；鈦酸丁酯；超聲水解；摻雜鎢；光催化分解水；析氧
（1. College of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha 410114, China;
2. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China）
Abstract:W doped rutile TiO2 powders with different W doping concentrations were prepared by low temperature ultrasonic hydrolysis using tetrabutyl titanate(C16H36O4Ti) as raw material. The powders were characterized by XRD, PL, DRS and BET. Using Fe3+ as electron acceptor, under condition of pH=2.0, UV irradiation and visible radiation, the effect of W doping concentration on the photocatalytic oxidation activity of rutile TiO2 particles was investigated. The results show that when W doping concentration is 1.0%−4.0%, W doping does not cause any change in rutile TiO2 crystal structure. Therefore, surface oxygen vacancies and the donor energy level near the bottom of the conduction band lead to easier departure of photoinduced electrons from holes to achieve stronger photocatalytic activity. The highest photocatalytic oxygen evolution and PL spectra intensity are achieved when the concentration of W is 2.0% , the O2 evolution speeds are 148.8 μmol/(L∙h) and 102.9 μmol/(L∙h) under UV irradiation and visible radiation, which are 30.6% and 65.7% higher than those before being doped.
Key words: rutile TiO2; tetrabutyl titanate; ultrasonic hydrolysis; W doping; photocatalytic water splitting; O2 evolution
